package org.jeemp.thread;


import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

/**
 * @author JackRen
 * @date 2021-03-04 10:00
 * @description:
 */
public class CallableThread implements Callable<Integer> {

    public static void main(String[] args) {
        CallableThread ctt = new CallableThread();
        FutureTask<Integer> ft = new FutureTask<>(ctt);
        for(int i = 0;i < 100;i++){
            System.out.println(Thread.currentThread().getName()+" 的循环变量i的值"+i);
            if(i==20){
                new Thread(ft,"有返回值的线程").start();
            }
        }
        try{
            System.out.println("子线程的返回值："+ft.get());
        } catch (InterruptedException e){
            e.printStackTrace();
        } catch (ExecutionException e){
            e.printStackTrace();
        }

    }

    @Override
    public Integer call() throws Exception {
        int i = 0;
        for(;i<100;i++){
            System.out.println(Thread.currentThread().getName()+" "+i);
        }
        return i;
    }
}
